Unrated severityNVD Advisory· Published Nov 26, 2025· Updated Dec 10, 2025
Authentication Bypass by Spoofing in GitLab
CVE-2025-12653
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.
Affected products
2cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*range: 18.3
- (no CPE)range: >=18.3, <18.4.5 || >=18.5, <18.5.3 || >=18.6, <18.6.1
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- hackerone.com/reports/3370245mitretechnical-descriptionexploitpermissions-required
- about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/mitrevendor-advisory
- gitlab.com/gitlab-org/gitlab/-/issues/579372mitreissue-trackingpermissions-required
News mentions
1- GitLab Patch Release: 18.6.1, 18.5.3, 18.4.5GitLab Security Releases · Nov 26, 2025